This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is not a composition. Its East Asian Width is wide. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+1F533 forms with similar adjacent characters prevents a line break inside it.
The CLDR project calls this character “white square button” for use in screen reading software. It assigns these additional labels, e.g. for search in emoji pickers: button, geometric, outlined, square, white.
This character is designated as an emoji. It will be rendered as colorful emoji on conforming platforms. To reduce it to a monochrome character, you can combine it with Glyph for U+FE0EVariation Selector-15: 🔳︎ See the Emojipedia for more details on this character’s emoji properties.
The Wikipedia has the following information about this codepoint:
In Euclidean geometry, a square is a regular quadrilateral, which means that it has four straight sides of equal length and four equal angles (90-degree angles, π/2 radian angles, or right angles). It can also be defined as a rectangle with two equal-length adjacent sides. It is the only regular polygon whose internal angle, central angle, and external angle are all equal (90°), and whose diagonals are all equal in length. A square with vertices ABCD would be denoted ABCD.
Representations
System
Representation (click value to copy)
Nº
128307
UTF-8
F0 9F 94 B3
UTF-16
D8 3D DD 33
UTF-32
00 01 F5 33
URL-Quoted
%F0%9F%94%B3
HTML hex reference
🔳
Wrong windows-1252 Mojibake
🔳
Encoding: GB18030 (hex bytes)
94 39 E8 31
RFC 5137
\u'1F533'
Bash and Zsh inside echo -e
\U0001F533
C and C++
\U0001F533
C#
\U0001F533
CSS
\01F533
Excel
=UNICHAR(128307)
Go
\U0001F533
JavaScript
\uD83D\uDD33
Modern JavaScript since ES6
\u{1f533}
JSON
\uD83D\uDD33
Java
\uD83D\uDD33
Lua
\u{1F533}
Matlab
char(128307)
Perl
"\x{1F533}"
PHP
\u{1f533}
PostgreSQL
U&'\+01F533'
PowerShell
`u{1F533}
Python
\U0001F533
Ruby
\u{1f533}
Rust
\u{1f533}
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